A friend [who recently left USA and has no plans to fly soon] has some 8k UA miles that expire in November.

If those miles are transferred to my [newly opened] UA account and that then merged with miles in my existing CO account, will that extend their validity? Or would I still have to use them before their original expiry date?

On a side note, can I pay for transfer [from his acc to mine] fees with my CC?

Many thanks.